Speaker
Peter Denton
(Niels Bohr International Academy)
Description
The initial data from the Event Horizon Telescope (EHT) on M87$^∗$, the supermassive black hole at the center of the M87 galaxy, provide direct observational information on its mass, spin, and accretion disk properties. A combination of the EHT data and other constraints provide evidence that M87$^∗$ has a mass $\sim6.5\times10^9$ $M_\odot$ and dimensionless spin parameter $|a^∗|\ge0.5$. These determinations disfavor ultra light bosons of mass $\mu_b\sim10^{-21}$ eV via the phenomenon of superradiance, within the range considered for fuzzy dark matter, invoked to explain dark matter distribution on $\sim$kpc scales. Future observations of M87$^∗$ could be expected to strengthen our conclusions.
Primary author
Peter Denton
(Niels Bohr International Academy)
Co-author
Hooman Davoudiasl
(BNL)
